When we feel an emotion, our brains trigger physical reactions, to that emotion.
You know how they say our hairs stand up, when we're scared?
It's true. It really does happen. And you can consider that a clue to fear.
And when we're really angry, blood rushes to our hands, making them feel warmer.
We may also experience a strong desire to physically move closer, to the source of our anger.
You can consider those two things clues to anger.
Your body often gives you clues to your emotions.

@rowndk
"Self esteem" is how we emotionally evaluate our self worth.
Basically, it's the amount that we believe that we are worth,
whether we believe we have the potential to be happy and find meaning,
or we believe that we're just a waste of space.
Your body can't give you "self esteem" to your emotions,
because self esteem isn't a physical thing.
It's a mental construct that you form on your own,
based on how you interpret yourself, and everything around you.